66623570 has 32 divisors (see below), whose sum is σ = 129508848. Its totient is φ = 24530688.

The previous prime is 66623551. The next prime is 66623591. The reversal of 66623570 is 7532666.

66623570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 42994249 + 23629321 = 6557^2 + 4861^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66623570.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87632 + ... + 88388.

Almost surely, 2^66623570 is an apocalyptic number.

66623570 is a deficient number, since it is larger than the sum of its proper divisors (62885278).

66623570 is a wasteful number, since it uses less digits than its factorization.

66623570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 66623570 is about 8162.3262615507. The cubic root of 66623570 is about 405.3927399931.

The spelling of 66623570 in words is "sixty-six million, six hundred twenty-three thousand, five hundred seventy".